one piece - What skills introduced prior to the formal introduction of Haki are Busoshoku Haki based? - Anime & Manga Stack Exchange

There are 6 techniques that are the keys to Rokushiki. Despite a claim in another answer from a well informed user that none of the CP9 members are haki users, several of these techniques seem to be

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Can you sort the types of haki based on when and what chapter it was introduced chronologicallly? - Quora

one piece - Was the first time Zoro experienced haki in Alabasta? - Anime & Manga Stack Exchange

one piece - What is Sabo's Power? - Anime & Manga Stack Exchange

one piece - Does the usage of Haki affect the user in any way? - Anime & Manga Stack Exchange

One Piece Might Have Just Explained Its Inconsistency - Screen Patrols

one piece - What type of Logia can defeat a Haki user? - Anime & Manga Stack Exchange

one piece - What skills introduced prior to the formal introduction of Haki are Busoshoku Haki based? - Anime & Manga Stack Exchange

Guimmard Claude, One Piece Role-Play Wiki

Does One Piece have any really emotional parts? - Quora

one piece - How did Spandam become the leader of CP9? - Anime & Manga Stack Exchange

When Did Haki First Appear In The One Piece Series?